Spongin is a modified type<span> of collagen protein, </span>forms<span> the fibrous </span>skeleton<span> of most </span>organisms<span> among the phylum Porifera, the sponges. It is </span>secreted<span> by sponge cells known as spongocytes. Spongin gives a sponge its </span>flexibility<span>.</span>
Answer: D,
They show the relief and excitement mission control workers feel when the lunar module lands on the moon.
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Answer:
Grendel's mother attacks Herot because she wants revenge for the death of her son. When she leaves, she ends up taking his arm that is hanging.
Answer:The excited students entered the dark cave and looked around. Two smart students saw some crayfish .
Explanation:
